knox and her boyfriend raphael were arrested in italy in 2007, accused of murdering knox's roommate marilyn kircher. her body was found in the bedroom where they lived, she and knox. knox's appeal was successful and had conviction overturned after spending four years in prison the murder charge. but italian law allows prosecutors to appeal acquittal and they want another bite at the apple. and lis wiehl, fox news analyst and mark fuhrman a former homicide detective. and this is extraordinary, this isn't done in our country. double-jeopardy. you get the conviction overturned and you're free. >> right. >> megyn: not so in italy and tell me if this high court decides she can stand trial again. she's back in seattle, washington. what happens. >> they'd have to extradite her and probably not going to happen. i don't see it getting to that point. you're right, i mean, it would never happen in this country. when you're the prosecutor, you lose, it's over, double-jeopardy attaches. here it's different and it's a high standard for a new trial. what new evidence do they have. what could it be that th